Salt, dicalcium phosphate and a feed block dig the hole break it mix it and your good to go. I buy about 50 lbs of salt very cheap, 10 lb of di-cal, and one mixed block made 4 sites. Di-cal is your biggest expense, I buy it through a local farmer because he gets it fairly cheap. The deer feed block is like $10. All of this you won't spend more then 40 or 50.

Dans right and if its done outside of the hunting season, it has to be within 50 yards of a dwelling occupied so even if legal in your county, it cant be done out of season unless you follow certain restrictions.

I just bought 150lbs from a private guy that mixes his own, much cheaper then buying imperial or antler king. Hollow a stump out and dump the mineral mix into it and on top of it. The deer will chew the whole thing away eventually. Plus in the winter time it helps to keep the mineral above ground making it easier access when everything else is covered in snow. The does need a lot of extra nutrient while pregnant and the minerals should help with better fawn production.

It seems early spring / summer is the peak time for use of minerals at my place. I have 2 products out at my site - rack stackers blaze mineral fountain and a brown block from the co-op. Deer have used both over last few years, but this spring the deer are really preferring the co-op block. Not sure why - maybe lack of moisture to get minerals coming down the tree. I think I am going to pour some of the rackstacker stuff right on a stump and see if it works better. Here are a couple of pics. I have mine in cover close to water and the block is on a stump if it that helps.

Mineral sites are best done in spring if you can. If you can't, like WI, I suggest putting it out under the snow the last day of the hunting season (then it is legal). Come spring, it will be ready to go.